超声处理对AZ91合金微观组织的影响.pdf

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1、Availableonlineat1『I，、『v、sciencedirect。com；Transactionsof姆ScienceDirectNonferrousMetalsSocietyofChinaELs】三VIERPressTrans．NonferrousMet．Soc．China24(2014)76—81www．tnmsc．cnEffectsofultrasonictreatmentonmicrostructuresofAZ91alloyYue—shuangYANG，Jin—chengWANG，TaoWANG，Cheng—mingLIU

2、，Zhong．mingZHANG1．StateKeyLaboratoryofSolidificationProcessing，NorthwesternPolytechnicalUniversity,Xi’an710072，China；2．SchoolofMaterialsScienceandEngineering，Xi’anUniversityofTechnology,Xi’an710048，ChinaReceived23October2012；accepted15March2013Abstract：Efleetsofultrasonictre

3、atmentonmicrostructureswereinvestigatedbyintroducingtheultrasonicoscillationintoAZ91alloymelts．Theresultsshowthattheultrasonictreatmentdoesnotchangethephasecompositionbuthasgreatinfluenceonsolidificationmicrostructures．Theareapercentageoflamellareutecticphaseincreasestothema

4、ximumwhentheappliedultrasonicpowerisincreasedto600Wandthendecreasesgraduallywiththefiartherincreaseofpower；meanwhile，theaverageareaofAlsMnphaseownsacompletelyopposingvariationtrend．TheareapercentageofMg17Al12decreasesgraduallywithincreasingtheappliedultrasonicpower．Mechanism

5、saccountedfortherefinementandfractionofdiferentintermetallicphaseswerealsodiscussed．Kevwords：AZ91alloy；ultrasonictreatment：microstructureUSTisarelativelynewandeffectivetechnology1Introduction『8-101．Thein仃oductionofpowerfulultrasonicoscillationsintomeltscanbequitesimplyadapte

6、dtotheMagnesiumalloyshaveexcellentpotentialstobeindus打ialsmeltingprocess．Inpractice．ul仃asonicusedasstructurematerialsinautomotive，electronicsandoscillationscanbedirectlyintroducedintosolidifyingaerospacefieldsduetotheirinterestingcombinationofmeltsviaanimmersedsono仃odeorindi

7、rectlythroughengineeringpropertiessuchaslowdensity,excellentthenon-contactapproach，dependingonthemeltingmachinabilityandgooddampingcapacity[1_4]．Thepointanditschemicalreactivitywiththesonotrode[1l】．mostwidelyusedMgalloyisAZ91alloy．However,itsForul仃asonicationoflowmeltingpoin

8、talloyssuchasstrengthandductilityarestillnotgoodenoughformoreMgandA1alloys，